refactor(clientSideScripts): reduce interval in testForAngular to 100ms

I noticed that the 1s interval in `testForAngular` was responsible for a significant part of my tests' duration. Shortening the timeout interval to 100ms from 1s reduced the length of my tests by up to 15s (60s to 45s).

It's not a huge change and I'm not familiar enough with the codebase to know if this wouldn't introduce changes elsewhere but I thought I'd send a PR in case the timeout interval's current length was an afterthought and not the result of a deliberate decision.